If your A.O. Smith water heater’s status light won’t come on, check the power supply, reset the unit, and inspect for any blown fuses or tripped breakers.
When your AO Smith water heater’s status light won’t illuminate, it indicates a problem with the ignition system. This guide provides step-by-step solutions to diagnose and fix the issue safely.
Why Your AO Smith Status Light Isn’t Working
Common Causes
- Power supply issues
- Tripped thermal switch
- Faulty gas supply
- Clogged air filter
- Defective thermocouple
Step-by-Step Troubleshooting
1. Check Power Supply
Verify the unit is receiving power. Check circuit breakers and ensure the gas supply valve is turned ON. For electric models, test the outlet with another device.
2. Reset the Thermal Switch
Locate the small reset button in the center of the thermal switch. Press it firmly. If tripped, you may hear a click. Try relighting the pilot after resetting.
If the status light begins flashing after reset, your water heater isn’t getting enough air. Clean the air filter or check for obstructions.
3. Relight the Pilot
Follow these steps carefully:
- Turn gas control knob to PILOT position
- Press and hold the knob down completely
- Click the igniter button repeatedly for 90 seconds
- Keep holding knob for 30 seconds after pilot lights
- Turn knob to ON position
New Installation Tip
New water heaters may have air in gas lines. It often takes multiple attempts to light the pilot. Be patient and persistent.
4. Inspect the Pilot Flame
If the status light still won’t flash, visually check the pilot:
- Look through the sight glass while attempting to light
- The pilot should be a small blue flame up and to the left
- Turn off room lights to better see the flame
Advanced Solutions
Check Gas Pressure
Inconsistent gas pressure can prevent ignition. Contact your gas company if you suspect pressure issues. For proper pressure measurement, professional tools are needed.
Inspect Thermocouple
A faulty thermocouple won’t keep the pilot lit. Signs include:
- Pilot lights but won’t stay lit
- Visible damage or corrosion
- Improper alignment with pilot flame
Clean Air Intake
Restricted airflow causes many status light issues:
- Turn off gas and power
- Remove combustion air cover
- Clean flame arrestor with soft brush
- Vacuum any debris
- Reassemble and test
When to Call a Professional
Contact an HVAC technician if you encounter:
- Gas odor (leave house immediately first)
- Persistent ignition failures
- Visible damage to components
- Unfamiliarity with gas appliances
For complex electrical issues, consider using a quality multimeter to test components, but only if you’re trained.
Preventive Maintenance Tips
- Annual professional inspection
- Monthly visual checks
- Keep area around heater clear
- Install carbon monoxide detectors nearby
According to AO Smith’s official documentation, most status light issues stem from simple ignition or airflow problems that homeowners can safely address.
